Boiler-flue-setting device



June 5, 1923.

F. SCHMlTT BOILER FLUE SETTING DEVICE Filed Oc't. 2l

y IJFA.

Patented June 5, 1923.

UNITED STATQIES FREDERICK SCHMITT, OF OAKLAND, CALIFORNIA.

I BOILER-FLE-SETTING DEVICE.

Application tiled October 21, 1920. Serial No. 418,346.

with the obgect primarily of eliminating the tendency of leakage which is sooner or later produced or occurs owing to the methods employed at the present time of setting tubes or ues in boilers, especiallyv those subject to ver high pressures, but in addition, l have ha in view the production of a construction and arrangement of parts which, while very similar to those of my previous patent mentioned, yet give rise to greater facility in application or removal of the fines, greater insurance against leakage of the joints, and considerable econom in material Without sacrifice of the required strength or resistance against fracture. Y

To best appreciate the advantages of 'my present construction it may be noted that at the present time the rolling method in the application of lues is employed, anda heavy flue sheet is required in order to obtain the necessary strength to withstand the strains of expansion and contraction of the tubes under actual working conditions. With my construction a much lighterv sheet may be utilized since in the application of the tube the metal of the same is not weakened by any manipulation thereof as is required in the rollin processes. With the adoption of a lighter ue sheet a greater flexibility is secured, thus permitting the usual distortion which is occasioned by the expansion and contraction, but without the resulting tendenc to fracture of the metal about the bri ge walls of the sheet and about the a d portions where riveted to the boiler re x supports. This is of great importance, for I have found from practical experience extending over many ears that boiler tubes can not be maintaine tight for any denite period unless the flue sheet is permitted to travel -With the tubes as ex ansion and contraction takes place. ny other diiculties resulting from the rolling ymethod of attaching tubes might be recited, and all of which are eliminated by my improvements. These will become apparent as this description proceeds and the invention becomes fully understood.

Referring now to the drawings for a full understanding of my present invention, reference is to be had to the following description and accompanying drawings 1n which:

Figure 1 is a vertical sectional view showing the specific flue fastening means ofl this lnventlon;

Figure 2 is a sectional view of the bushing or thimble element;

Figure 3 is a similar View of the securin and clamping member; and

Figure 4 is a view similar to Fig. 1, but showing a modified form of the flue involving the enlarged extremity sometimes found desirable.

Throughout the following description and on the several figures of the drawing, sim- 1lar parts are referred to by like reference characters.

In the drawings, A designates the ilue sheet which is provided with the usual iiue i openings, any suitable number of which are employed depending upon the capacity or requirements of the boiler. B deslgnates a flue which is connected thereto by the fastemng means forming the particular subject matter of thisv invention and consisting of the bushing or thimble 1 and the securing or clamping member 2 shown in Figs. 2 and 3 respectively.

Referring to the bushing 1 it will be observed that at one end this is providedwith an annular shoulder orhead 3 while at its other end the bushing is formed with an inner annular shoulder 4 constituting a seat against which the end of the flue B abuts: Exteriorly this bushing is threaded asiindicated at 5 so as to be screwed into the threaded flue openings of the sheet A. In the application of the bushing thesame is screwed into the proper opening until the annular shoulder engages with the outer face of the flue sheet. In other words this bushing, contrary to the operation of the equivalent element in my previous patent, is introducedA into the opening from the outside and is scribed. The joint is made more firmly snug by manipulation of the clamping and securing mem er 2 which will now be dcscribed.

The member 2 is provided at one end with the annular head 6 and exteriorly threaded at itsother end as indicated at 7 to a point substantially midway of this element so as to be screwed into the tube B which is correspondingly threaded for this purpose. Be-

tween the threaded portion 7 and the head 6 this member is formed with a tapering surface 8 which conforms to a similar formation of the interior of the thimble or bushing l as indicated at 9, so that a main or primary seat between these two parts is thereby provided. The inner periphery of the annular shoulder 3 of the bushing is reamed out so as to form a further seat 10 that conforms to the shape of the surface of the head 6 of the securing member 2 so that when the latter is screwed into place as shown in Fig. 1 of the drawing, a snug leak-proof joint is provided at this point. With this form of construction it is readily feasible in the reseating of tubes to renew or reseat the inner bearing surfaces of the bushing and securing member should it become necessary.

As will be apparent from the foregoing description in the application of my connecting means, since both elements thereof are introduced into the Hue sheet openings from the outside of the sheet, the operation is greatly facilitated and it is possible to remove any one or number of tubes at any time it is necessary so to do without difficulty, thus permitting of maintaining the boiler clean and affording a means of access to such parts of the boiler structure for such purposes of inspection or other reasons as are now substantially inaccessible without cutting out the tubes. In other words, with this arrangement of the parts it is never necessary to cut out a tube when it is desired to remove the same, unlike the invention of my previous patent referred to or the constructions now generally in use which are connected to the Hue sheet by the rolling recesses hereinbefore mentioned. It will apparent that one of the reasons which make it necessary to employ a relatively thick Hue sheet resides in the fact that in use different tubes or flues expand to different extents so that as a result the Hue sheet is unevenly distorted and when after use some of these Hues are replaced a diH'erent length of tube from the .original is required so t at the Hue sheet undergoes extreme stresses due to the diHerences in the len hs of the tubes which are employed. Wit this relatively heavyV Hue sheet the uneven stresses'have a great tendency to fracture the metal owing to these uneven strains, but in the use of my invention above described, tubes of a pre determined. length throughout are capable o The onl of being used and the adjustment of the connection is employed to great advantage to secure the proper leak-proof joints that are necessary in high pressure boilers such as used on locomotives. Under the conditions it therefore becomes possible for a lighter Hue sheet to be employed and this permits of greater HeXibility and less tendency to fracture is the result, since the flue sheet will more readily follow the even expansion and contraction of the Hues. Another great advantage of this arrangement of parts described hereinbefore lies in the fact that the expansion of the tubes in use tends to more snugly fit the joints which is of great importance as will be obvious to one skilled in this art.

In the manipulation or application of the clamping or securing member 2 the tube B is drawn against the shoulder 4 when this member is screwed home and this action together with the preliminary seating of thel end of the tube against said shoulder produces a most excelent leak-proof joint at this point. -The tapered construction of the bearing surfaces of the bushing and securing member also produces a leak-proof litting of the parts as will be obvious. It will be understood that one of these connecting means may be used at each end of the tube or I may employ the device above described at one end and the form of the invention shown in my previous patent at the other end.

difference between the form shown in igs. 1 and 4 lies in the enlar ement of the end of the Hue B at the point indicated at 11, the advantages of the preferred construction being equally present in this arrangement so that they need not be further referred to.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In combination, a Hue sheet provided with a Hue opening, a Hue, a bushing adapted for insertion in said opening from the outer side of said Hue sheet and extending slightly beyond the inner side of said flue sheet so as to form a supporting extension for the end of the Hue seated therein, said Hue terminating short of said Hue sheet, and a clamping and securing member adapted for insertion from the corresponding side into the mouth of the flue.

2. In combination, a Hue sheet having a Hue opening, a Hue, and means for connecting said Hue to the sheet including a bushing adapted for insertion in said Hue opening into abutting engagement with the end of the Hue, said Hue terminating short of the Hue sheet, and a clamping member insertable through said bushing into enga ement with the Hue and operable to draw t e Hue into firm Contact with the bushing.

3. In combination, a flue sheet having a flue opening, a flue arranged at one side of said sheet, and means for connecting said flue to the sheet including a bushing adapted for insertion into said opening from the side opposite the ue to abut and produce pressure against the end of the fiue in a direction longitudinally thereof for seating purposes, and a clamping and securin member engageable with the interior of t e mouth*- of the flue to draw the same in the opposite direction.

4. In combination, a Hue sheet having a flue opening, a Hue, a bushing having threaded connection in the ue opening and formed at 'one end with an annular shoulder adapted .to seat against the outerface of the flue sheet and an inner annular seat at its opposite end to receive the flue, said bushing 'being capable of firmly seating the flue on said seat in the operation of screwing the` bushing home, and a clamping and securing member exteriorly threaded at one end for connection with the flue and operable 'to draw the Hue against the end seat of the bushing as aforesaid. l

5. In combination, a flue sheet having threaded openings therein, ilues, and fasten ing means for connecting the flues in the openings comprising a bushing exteriorly threaded and having a shoulder at one end and a flue seat at its opposite end, said bushing being provided with an interior contracted bearing surface, and a securing and clamping member formed intermediate its length with a bevelled bearing surface corresponding to the contracted surface of the bushin said securing member being exterior y threaded at one end to extend into the flue and headed at its other end to coact with the bushing when screwed home.

In testimony whereof I affix my signature.

FREDERICK SCHMITT. 

